Tucket



N0. 752,257. PATENTED FEB. 16, 1904. J. G. POTTER & J. JOHNSTON. METAL WORKING MACHINE. APPLICATION nun my 8, 1902.

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NO MODEL.

i fw I 'PATENTED PEB.16,1904. /F

J. c. POTTER & J. JOHNSTON.

METAL WORKING MACHINE. APPLICATION FILED my a, 1902.

I0 MODEL.

vNo. 752.257. 7 PATENTED FEB. 16, 1904.

J. G. POTTER & J. JOHNSTON.-

METAL WORKING MAG HINE.

APPLICATION FILED MAY 8. 1902.

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.80 MODEL.

IIIlIIIB-IIIIIIIIIHU' Yatented February 16, 1904.

UNITED STATES PATENT," OFFICE.

JAhES C. POTTER AND JOHN JOHNSTON, OF PAWTUOKET, RHODE IfaLAND,

ASSIGNORS TO POTTER 'AND JOHNSTON MACHINE CO1\PANY,=OF PAW- TUCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

' METAL-WORKING acrame.

SPECIFICATION forming partmf Letters Patent No. 752,257, dated February 1:6, 1904.

Application filed Kay 8, 1902. Serial No. 106A88. (N0 model.)

To all whomit may concern:

Be it known that we, J AMES 0. Porrnn and JOHN JOHNSTON, of Pawtucket, in the county of Providence, and in the State of Rhode Island, have invented certain new and useful Improvements. in Metal-Working Machines; and we do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, in which Figure 1 is a longitudinal section of enough of a turret-lathe to illustrate our invention. Fig. 2 is a rear elevation thereof, and Fig. 3 is a cross-section.

The object of our invention is to improve the tool supporting and operating devices of machines for turning or performing other operations on metal; and to this end our invention consists in the features of construction substantially as hereinafter specified and claimed.

Certain features of our invention are especially applicable to turret-lathes, and we therefore illustrate'our invention as embodied in such a lathe; but itis to be understood that those features of our invention which are capable of use in other machines are not to be restricted to use in turret-lathes.

In the embodiment of our invention illustrated a turret A, provided with sockets in its side for tools, as usual, is mounted on a slide B, being rotatable about a vertical post 6 or bolt rising from the slide. By the reciprocation of the slide the turret-tools are movable to and from work in a chuck C, and, as usual, the turret is automatically rotated to bring the tools in succession in position for operation on the work. Rising from the slide at the rear end thereof is a post or standard I), from which a stout bar I) extends forward, and at its front end it has an opening through which the upper end of the turret-post 6 passes. The turret is thus rigidly braced or supported at its upper end.

Carried by the turret is a bracket E, attached thereto by screws which pass through a vertical portion that overlaps the turret side and a horizontal portion that overlaps the turret top, and rising from said bracket is a plate-like extension 6, in which is a series of horizontal round holes or openings e as shown three, that are at points successively farther and farther from the turret-axis. A cut or slit 0 extends from one hole to the next, and passing through each slit portion of the plate e from oneside of the slit to the other is a screw a by which the diameter of the holes may be contracted to clamp the shanks f of a holder F placed therein. When, for example, .it is desired to turn bodies of different diameters, the tool may be given the proper position by being placed in the hole most suitably located in view of the diameter to be turned, and for turning pieces having portions of diiferent diameter the diiferent diameters may be turned at the same time by secur ing the required number of tools in the holes. Foraccurate rotatable adjustment of the toolholder its shank f is providedwith two parallel longitudinal grooves'f' and two screws f passing from the upper edge of the plate e through openings that intersect the tool-post hole at points where the near ends of the screws can engage the bottoms of the grooves.

It will be seen that by moving one screw outward and the other inward the tool-post will be rotated on its axis.

. Although we have mentioned turning-tools as used with our tool-holder, it is to be understood that other tools can be used.

The tool-slide is mounted to move in guides on a block G, secured to the bed or frame H, and it is attached thereto by bolts that pass through slots in the block to enable the block to be shifted bodily toward and from the chuck. On the under side of the slide B is a rack 6 in mesh with a pinionI, situated in a slot in the block on a shaft K, having bearings in the block. Mounted in horizontal guides in the frame H below the block is a bar L, having on its upper sidea rack Z, meshing with the pinion, which bar on being' reciprocated rotates the pinion and through the latter reciprocates the tool-slide. At the front end of said bar, on the lower side thereof, is a roller l in the path of cam-plates m on the periphery of a drum M, which plates by the revolution of the drum engage the roller alternately and move the bar first in one direc-' tion and then in the other, such arrangement being a common one. The drum M is mounted on a shaft N, and for revolving it there is attached to one side of the drum a spur-gear m, with which meshes a pinion 0 on a shaft 0, receiving motion from a suitable source, preferably the shaft N, to which it is geared by a train of gears. (Not shown) The slide-block G is shiftable, so as to have it in a position that will best suit the slide, according to the position it may be necessary'to give the latter in View of the work to be operated on, and thus reduce to a minimum the overhanging by the slide in its reciprocations. To avoid derangement of the relative position of the roller Z and the cam-plates m from adjustment or shifting of the position of the block and slide, the slide and bar are disengaged from each other, so that when the slide is moved it will not affect the position of the bar L. A convenient wayof elfecting such disconnection is to shift the pinion I in an axial direction to disengage it from either or both racks. Preferably one of the racksthe sl-ide-rack-is made of a width double that of the face of the pinion, so that the pinion will remain in mesh with said rack when slid far enough to disengage it from the other rack. This arrange-' ment makes it necessary to reengage the pinion with but one rack, and so greatly facilitates the operation of adjustment. A convenient expedient for shifting the pinion is to confine it between shoulders or collars on its shaft K and to make the latter longitudinally movable. For holding the shaft, with the pinion,

! in either of its positions the shaft has two an nular grooves is, adapted to be engaged by a latch-pin on the block G.

Our machine has a cross-slide P, mounted on a guide-block Q, secured to the bed H, so that it may be adjustable toward and from the work, as may be required- In the under sideof its portion at the rear or back of the ma.- chine the cross-slide has a rack p, with which meshes a gear-segment R on a rock-shaft S, journaled in bearings in brackets secured to the rear side of the frame H. The segment R is adjustably attached to the shaft, so that it may be given such position on the same as is required by the position of the cross-slide. Also on the rock-shaft is a gear-segment T, that meshes with a gear-segment U on the upper end of the lever V, pivoted to a bracket W, fastened to the frame H. Pivotally connected with the lever V is one end of a bar X, whose other end is forked to straddle the shaft N, the bar being thus supported by the shaft. Projecting from the side of the bar X intermediate its ends is a roller a: in the path of cam-plates m carried on the side of the drum M. For the attachment of said cam-plates the drum has an inwardly-projecting annular flange 'm, that is provided with continuous enable the bolt that connects it and the bar to be shifted .to difierent distances from the center of motion of the lever. The speed of movement of the cross-slide can thus'be varied, and though the adjustment of the connection between the bar and lever to points at diflerent distances from the center of motion of the lever results in variation of the travel of the cross-slide such variation can be compensated for by shifting the position of the tool-post on the cross-slide accordingly.

Though in the embodiment of our invention we prefer the details of construction and the organization of parts as herein shownand described, it is to be understood that we consider ourselves entitled to embodiments of our invention in which there may be changes in these respects.

Having thus described we claim is 1. The combination of a tool-slide, a shiftable block on which theslide is mounted, and means for reciprocating the slide, the connection between the slide and its reciprocating means being detachable, whereby the position of the block may be shifted independ ently of, and without disturbing, the reciprocating means.

2. The combination of a tool-slide, a shiftable block on which the slide is mounted, and means for reciprocating the slide comprising a cam, a part to cooperate therewith, the connection between the slide and its reciprocating means being detachable, whereby the position of the block may be shifted without affecting the relation of the cam and its coopcrating parts. a

3. The combination of a tool-slide, a shiftour invention, what able block on which the same is mounted, and

means for reciprocating the slide, comprising a cam-actuated bar, the connection between the slide and the bar being detachable.

4. The combination of a tool-slide, a shiftable block on which the same is mounted, a reciprocable bar, and a detachable rack and pinion gearing between the bar and the slide, the block being shiftable independently of the 5. The combination of a tool-slide, a block on which the same is mounted, a rack on the slide, an axially-movable pinion meshing with the rack, a bar having a rack meshing with the pinion, and means to reciprocate said bar, {She block being shiftable independently of the IIO 6. The combination of a tool-slide having a rack, a reciprocating bar having wreck, and an axially-movahlepinion meshing with both 7 racks, one of said racks having a-width greater 5 than the face ofthe pinion. 4 7 The combination-ofa tool-slide, a'rookshaft, gearing between said shaft and the slide, comprising a segment adjustable along the shaft, and means for reciprocating the Io shaft. v

, 8 The combination of a tool-slide, a'lever,

connections between. the lever and the tool- "slide, a cam-actuated bar, and an adjustable connection between the bar and the lever.

In testimony that we claim the foregoing I5 we have hereunto set our hands this 3d day 7 of April, 1902. JAMES C. POTTER.

JOHN. JOHNSTON. Witnesses? ELLA A. BISHOP, GEO. I. PARKER. 

